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Biasi has been in business for over 74 years. Since you are here, it means you have a problem with your Biasi boiler and are looking for an answer. 

On this page, you’ll find a list of Biasi error codes and faults. These can help you identify the exact problem you have with your Biasi boiler and know what is happening. Knowing what the problem is helps you know how much it is going to cost you if your boiler is out of warranty.  

That being said, if your boiler has been giving you troubles, then maybe it is time to get a new boiler. Getting a boiler replacement is a good investment because it can save you money on high repair costs and you will be getting a more efficient boiler that can save you money on your heating bills.  

With Let’s Heat, you can easily get an online quote and make use of our boiler finance plan. We offer a range of boilers and we work to the highest standards. 

Most Common Biasi Boiler Error Codes
Biasi Boiler Error Codes / Fault Codes  3

What are boiler fault codes?

Boiler fault codes are alphanumeric indicators used by modern boilers to communicate specific issues or faults that may have occurred within the heating system. These codes help both homeowners and heating engineers identify and diagnose problems quickly, facilitating efficient troubleshooting and repair. When a boiler encounters a malfunction or experiences an issue, it generates a fault code that can be displayed on the boiler’s control panel or digital display.

Each fault code corresponds to a particular problem or error, such as issues with ignition, pressure, temperature, sensors, or other components of the heating system. By referencing the boiler’s manual or consulting with a qualified technician, users can interpret these codes to understand the nature of the problem and take appropriate action.

Understanding boiler fault codes is essential for timely and effective maintenance, ensuring that heating systems operate smoothly and efficiently. In many cases, resolving the underlying issue may require professional assistance, but the fault codes serve as a valuable tool for initial troubleshooting and diagnosis.

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A Short History of Biasi 

Leopoldo Biasi, in 1938, started a small thermomechanical business in Italy. After that, in the 1940s, he opened a facility with the aim to manufacture residential boilers. In 1990, Biasi started their UK boiler operation in order to prompt boilers, towel rails and radiators as well across the UK.  

Biasi produces a range of system and combi boilers with different kW outputs to suit different sized properties. Biasi is a budget boiler, which makes it suitable if you do not want to pay much for a boiler.  

The table below shows the error or fault codes of the Biasi boiler. This will make it easier for you to identify what issues you are having with your boiler.  

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Biasi Boiler Error Codes / Fault Codes 

Error Code Boiler Fault 
ER 01 + Reset     Lack of burner ignition on safety lockout 
ER 02 + Reset Safety thermostat intervention lockout 
ER 03 + Reset General lockout 
ER 04 + Faulty primary circuit (no water or absence of flow) 
ER 05 + Faulty fan control system 
ER 06 + Faulty Central Heating temp. probe NTC 
ER 07 + Faulty Domestic Hot Water (DHW) temp. probe NTC 
ER 08 + Faulty external temp. probe NTC 
ER 09 + Faulty flue temp. probe NTC 
ER 10 + reset Flue probe intervention lockout 
N/A Flame detection error (An flashing + number error flashing) 
ER 12+ Faulty central heating temperature probe NTC 
ER 13 + DT Delivery return >40k 
ER + 14 + Reset     Faulty pump or primary temperature above 105°C 
ER + 14 + Reset       Faulty pump or primary temperature above 105°C 
ER + 14 + Absence of flow from temperature gradient (>2K/s) 
ER + 19 + Domestic hot water inlet probe failure (if sent) 
ER + 25 + Reset     Flame detection fault 
ER + 69       Wiring fault lockout 
Li       Primary circuit temp. limit during domestic hot water operation 
—     Boiler Stand-By, hyphens are turned on in sequence to simulate running/antifreeze protection activated) 
N/A Boiler Stand-By, hyphens are turned on in sequence to simulate running/antifreeze protection activated) 
N/A Filling request: The boiler works regularly and the display shows all the icons, but the signal FL is flashing every 1 sec. 
30c Boiler waiting for heat request 
N/A Boiler in summer mode (d.h.w.). The primary circuit temperature is displayed. 
N/A Boiler in winter mode (c.h.+ d.h.w.) The primary circuit temperature is displayed. 
N/A  Boiler on demand for d.h.w. power. The d.h.w. temperature is displayed. / Boiler on demand for c.h. power. 
N/A Burner ignition (spark) 
N/A Flame present (Burner on) 
N/A Pre-heating function 3 starts DHW comfort. This information is not displayed. It will be possible to check its state in the section “INFO” value “cF” (the signal “cF” is alternated to the CH temperature value until the end of this function). You can enter the function by pushing buttons 12 and 13 together. The function is confirmed showing ON or OFF alternating for 5 sec. This function is always active at every hour (it’s not possible to set the time slots unless a remote control is connected). 
N/A Pre-heating function 3 starts DHW comfort. This information is not displayed. It will be possible to check its state in the section “INFO” value “cF” (the signal “cF” is alternated to the CH temperature value until the end of this function). You can enter the function by pushing buttons 12 and 13 together. The function is confirmed showing ON or OFF alternating for 5 sec. This function is always active at every hour (it’s not possible to set the time slots unless a remote control is connected). 
N/A Boiler in anti-freeze phase (bP flashing + temperature flashing) 
N/A Boiler in antifrost phase (AF flashing + temperature flashing) 
N/A Set c.h. (all other symbols are disabled) 
N/A Remote control connected – 1 flash every 4 seconds 
N/A Set d.h.w. (all other symbols are disabled) 
N/A Pump activated for the post-circulation phase (Po flashing + temperature flashing) 
N/A Delayed burner ignition for setting the system (uu flashing + temperature flashing) 
N/A Maintenance required The wrench symbol is flashing (without showing any error) 
LP Boiler in chimney sweep in function. The activation of the chimney sweep occurs configuring the “parameter P09=01” and is visualized: LP= minimum dhw hP= minimum heating cP= maximum heating dP= maximum dhw. The transition occurs with keys 16 (increase) and 15 (decrease) dhw temperature. The writing on the display alternates. 
N/A Boiler in chimney sweep function. The activation of the chimney sweep occurs configuring the “parameter P09=01” and is visualized: LP= minimum dhw hP= minimum heating cP= maximum heating dP= maximum dhw. The transition occurs with keys 16 (increase) and 15 (decrease) dhw temperature. The writing on the display alternates. 

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How to reset biasi boiler?

Resetting a Biasi boiler typically involves a few steps. Keep in mind that the exact procedure may vary based on the specific model of your boiler. Here is a general guide:

  1. Check the Display Panel: Look at the display panel on your boiler. It might show an error code or a symbol indicating a problem. Take note of any information displayed.
  2. Consult the Manual: Refer to your boiler’s user manual. It will provide specific instructions for resetting the boiler based on the error code or issue you’re experiencing. If you don’t have the manual, you can usually find it on the manufacturer’s website.
  3. Power Cycle: A common step is to power cycle the boiler. This involves turning the boiler off, waiting for a few seconds, and then turning it back on. There may be a power switch on the boiler itself, or you might need to use the mains power switch.
  4. Reset Button: Some boilers have a reset button that you can press to clear error codes and reset the system. Refer to the manual to locate the reset button on your specific model.
  5. Pressure Adjustment: If the issue is related to pressure, you might need to adjust the pressure settings. Again, consult your manual for guidance on how to do this safely.
  6. Thermostat Check: Ensure that your thermostat is set to the desired temperature. Sometimes, a simple adjustment of the thermostat can resolve issues.
  7. Gas Supply: Make sure that the gas supply to the boiler is turned on. If it’s off, the boiler won’t function.
  8. Professional Assistance: If you’re unable to resolve the issue or if you’re not comfortable performing these steps, it’s advisable to contact a qualified heating engineer or the boiler manufacturer’s customer support for assistance.

However, in some cases, getting a new boiler might be more cost-effective than getting your old boiler fixed. Some issues might be costly to fix. What is more, a new boiler will probably be more efficient and can help you save both money and energy. That is why getting a new boiler is a good investment in the long run.  

Get a quote from Smart Adapt. We have a large range of products and our staff of Gas Safe engineers provides an excellent service that is both professional and reliable. In addition, we can help you get the boiler that best fits your house and heat requirements. 

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Any more questions?

If you have any further questions about Combi boilers, other Boilers, or anything else, please see our FAQ Page because you might find the answers there or on our News Blog.

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